Respiratory mask



FIG. 1 is a top perspective view of a respiratory mask;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a front elevation view thereof;

FIG. 6 is a rear elevation view thereof;

FIG. 7 is a left side elevation view thereof; and,

FIG. 8 is a right side elevation view thereof.

The dash-dash broken line showing of portions of the respiratory mask form no part of the claimed design.

The dot-dash-dot broken lines define the bounds of the claim and form no part thereof. The boundary lines appear on interior surfaces of the respiratory mask, where visible, and immediately adjacent to claimed edges, representing that the interior surface forms no part of the claimed design. 

CLAIM The ornamental design for a respiratory mask, as shown and described. 